Senior Application Developer

Aon is in the business of better decisions

At Aon, we shape decisions for the better to protect and enrich the lives of people around the world.

As an organization, we are united through trust as one inclusive team and we are passionate about helping our colleagues and clients succeed.

What the day will look like

Delivering and maintaining APIs, actuarial calculation engines and simulation models, data assets, and single-page applications (SPAs) using technologies such as .NET, Python, TypeScript, Angular, and D3.js.

Using C#, .NET to build API's both for specific application use, and more general use across the platform.

Contributing to design, build, test & maintenance activities and be genuinely motivated by delivering solutions and issue resolutions to our business

Develop and maintain CI/CD pipelines as code

Promote and adhere to development standards through automation tooling and manual controls incl. JIRA, agile standards, code reviews and release automation, etc

Work with Product Owners, Scrum Masters and Business Analysts on the vision, design, requirements, and delivery of web-based analytics applications

Develop a thorough understanding of the functional and non-functional requirements of the application, how customers use it, and how best to serve these needs

Ensure effective operation of business systems through Level 3 support of application incidents, effectively triaging bugs, code/data fixes, testing & patching processes

Welcome the opportunity to assist and spread knowledge to other members of the team

Support QA in testing products and resolving found issues

Deliver and maintain solution/process documentation to an agreed level

Track and report on progress to Software Engineering Manager, Product Owners & Scrum Masters

Skills and experience that will lead to success

Minimum of 5 years' development experience with C#, .NET, Angular, TypeScript, or similar technologies.

BS or MS degree in Computer Science, Information Technology or equivalent experience

Keenly interested in software development, staying up to date with current trends and able to translate those into solutions.

Experience with Cloud (AWS, Azure), Serverless Architecture, Agile, DevOps (CI/CD) and database technologies

Experience working in Agile environments

UI/UX experience a plus

Working knowledge of SQL/NoSQL databases, report generation, and data modelling in analytics contexts.

A strong interest in Artificial Intelligence, including hands‑on experience using AI‑enabled development workflows (e.g., Claude Code, GitHub Copilot).